315.15
Examination of witnesses.

When a county engineer or his deputy is called upon to make a
survey to be offered as evidence, the adverse party having notice of the time
of the making of such survey, the county engineer or deputy, upon application
of either party to the cause of action, shall administer an oath to any witness
brought to prove any corner or line of such survey, or the existence of any
natural or artificial object or mark which is necessary to identify any corner
or line of such survey. Such testimony shall be reduced to writing, subscribed
by the witnesses, and return thereof made to the court with the return of the
survey.